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Aug. 27, 1929. H, B, MELLOTT 1,726,036

FURNACE Filed Dec. 51. 1927 Patented Aug. 27, 1929.

UNITED STATES HARRY B. MELLOTT, OF TOLEDO, OHIO.

FURNACE.

Application filed December 31, 1927. Serial No. 243,876'.

This invention relates to promoting combustion efficiency.

y This invention has utility when incorporated in heating apparatus having burners, more especially for fiuid fuel.

Referring to the drawings: l Fig. 1 is a side elevation, with parts broken away, of an embodiment of the invention in a hot air pipe type of furnace for heating buildings or rooms remote from the furnace;

Fig. 2 is an enlarged view in vertical sec tion of the furnace of Fig. 1; l

Fig. 3 is a section on the line III- 111, Fig. 2, looking `in the direction of the arrow;

Fig. 4' is a section on the line TV-JV, Fig. 2, looking in the direction of the arrow; Fig. 5 is a section on the line V-V, Fig. 2, looking in the direction of the arrow; and Fig. 6 is a section on the line VI-VL Fig. 5, looking Iin the direction of the arrow. h

Say on floor 1, in basement of a building thereby providing furnace room 2, as remote from room 3 to be heated, there is located furnace having base 4 equipped with outer shell 5 having insulation or heat retaining jacket 6. This outer shell 5 carries brackets 7 mounting therein concentric cylindrical portions 8, 9, 10, 11, thereby provided, as spaced radially linward from the shell, warm air riser chambers 12,13, 14, as spaced from each other by combustion chambers 15, 16.

In the vlower portion of the outer combustion chamber 15 is located ring burner 17. The brackets 7 carry this ring burner 17 with clearance from the base 4. In this clearance region there extends, controlled by valve 18, gas supply line 19, having branches 2O to air mixers 21 delivering at spaced re* gions to the burner 17. These air mixers 21 are isolated from the interior of the shell 5 by air supply ducts 22. For additionally promoting combustion, ducts 23 through the shell 5 conduct air from the basement room 2 as the same source of supply for air as the ducts 22. These ducts 23 through the shell extend through the shell 8 to ring chamber 24 having upper endless annular ,n at the inner sideof the shell 6 5+ i ingly in prinrinii te the. our;

combustion chamber 15. There is accordingly supplied this auxiliary air, as a cooling screen thus holding the region of the shell 8 as in the vicinity of the burner 17 from high temperature attack as well as additionally supplementing the mixer air for promoting combustion at the burner 17.

This chamber 15 intermediate its height is provided with annular first baffle 26. In this instance there is shown below this baffle 26 and carried by brackets y27 hot water coil 28 say for domestic heating purposes. Below this first baffle 26 there is connection from this chamber 15 by transverse ducts 29 to combustion chamber 16. This combustion chamber 16 is herein shown as having closed lower end 30 and closed upper end 31.

Spaced from the upper end '31 there are outward connections 32 similar to the inward connections 29 and extending from this chamber 16 into upper portion 33 of the outer combustion chamber as spaced from this portion 33 by the baffle 26 thus communieating primary outer combustion chamber portion 15 with the secondary upper similar diameter combustion chamber 33.

This chamber 33 has thereover second bai'lie 34 with openings 35 therefrom into the upper region between the shells, 3, 9, as closed by top 36. Oiftake 37 from this region between the second baille 34 and the top 36 is disposed remote from these openings 35. For further retarding the velocity of combustion products flow, the second baffle 34 has therein partitions 38 rising short of the top 36 and alternating with partit-ions 39 depending from the top 36. There is thus formed a vertical Zig Zag path in the two directions from the opening 35 to the oflitake 37. 90

Outer door 10 in the shell 5 may be opened to give access to inner door 11 in the shell 8 so that there may be lighting of the fuel at the burner 17. It is accordingly understood that these doors 40, 41, are normally closed in furnace operation.

Cold air doWnpipe 12 from the room 3 is shown as4 having discharge ope' 'iig 43 into tl l 5 below 'the end 3C* 1 'ier ceiinmoii :hainher 16 and bel-1' of 1w the outer combustion or primary combustion chamber 15 as carrying the burner 17. lt lis thus seen that the lower portion of the housing provided with the shell 5 has therein a primary cold air chamber 45 upwardly from which extends the outer air warming ring chamber' 12 with radially inward air warming chamber 13 as intercepted by cross connection ducts 29, 32. Also in communication with this primary lower cold air chamber 35 is inner riser 14. lt is accordingly seen there are three concentric air warming ducts or chambers rising from this chamber 45 which chambers serve as air jackets for the combustion chambers 15, 16, 33. rlhe air as warmed, in rising from the chamber 45, comes to top distributing chamber 46 and from thence passes by warm air riser ducts 47 to the room 3 or other remote location from the furnace.

It is accordingly seen that in this disclosure there is complete isolation of the heated air circuit to the remote room. This means that the combustion operation promoting air supply herein shown as taken from the furnace room does not deplete the air circuit as involved in the warm air heating. Furthermore, litgives a stability to the circuit not only in heat efhciency but in burner operation even at minute fiame therefrom, and the doors 40, 41 may be open for inspection without thereby blowing out more or less. of this burner 17 adjacent to dame jet regions.

What is claimed and it is desired to secure by Letters Patent is:

1. A furnace comprising an outer insulated shell, a ring burner therein, first and second concentric radially spaced chambers for combustion products from the burners, the first chamber rising from said burner and provided with an intermediate baffie, connection below said bafile from the first to the second chamber, additional connection from t-he second chamber above the baille back to the first chamber, an additional upper baffle means in the first chamber, and thereafter an off-take for products of com bustion from, the first chamber.

2. A furnace comprising an outer insulated shell, a ring burner therein, first and second concentric radially spaced. chambers for combustion products from the burners, the first chamber rising from said burner and provided with an intermediate baffle, connection below said bathe from the first to the second chamber, additional connection from the second chamber above the bame back to the first chamber, a second baie in the upper portion of the first chamber and parallel to the first baffle, staggered partitions coacting with the second bafile, and thereafter an ofltake for the products of combustion from the furnace.

3. A furnace having a heating chamber,

means in said furnace for an air circuit to be heated comprising a heat conducting` chamber about said heating chamber, a burner in said heating chamber, a combustion supporting air chamber in said furnace independent of said heating chamber and said heat conducting chamber, said combustion supportingair chamber being provided with a way having communication with the heat ing chamber through which way air is delivered to the region about the burner, and duct means from exterior of said furnace for supplying air to said combustion sup porting air chamber whereby said air in passing through said duct means and air chamber is preheated before being delivered to said heating chamber.

4. A furnace having a heating chamber, means in said furnace for an air circuit to be heated comprising a heat conducting chamber about said heating chamber, a burner in said-heating chamber, a combustion supporting air chamber in said furnace independent of said heating chamber and said heat conducting chamber, said combustion supporting air chamber being provided with a way having restricted communication with the heating chamber through which way air is delivered to the region about the burner, and duct means from exterior of said furnace for supplying air to said combustion supporting air chamber whereby said air in passing through said duct means and `air chamber is preheated before being delivered to said heating chamber.

5. A furnace having a heating chamber, means in said furnace for an air circuit to be heated comprising a heat conducting chamber about said heating chamber, a burner in said heating chamber, a combustion supporting air chamber in said furnace independent of said heating chamber and said heat conducting chamber, said combustion supporting air chamber being provided with a way having restricted communication with the heating chamber through which way air is delivered to the region about the burner, and duct means from exterior of said furnace for supplying air to said combustion supporting air chamber forvdelivering combustion supporting air to the region about said burner, said restricted communication being provided with directing means preeluding said air from directly striking said burner as delivered from said air chamber.

6. A furnace comprising a heating chainber having a floor and a side wall, a burner disposed on said floor and directed toward said side wall, and a combustion supporting air chamber provided with communication to said heating chamber for providing a moving air curtain between said side wall and burner.

7. A furnace comprising a heating chainber having a floor and a side wall provided with an opening therebetween, a burner dis posed centrally of said floor and directed toward said side wall, said floor and side Wall being provided with downward extensions forming a preheating chamber therehelow, said opening forming a restricted communication between said chambers, ducts from the furnace exterior to said preheatng chamber whereby combustion supporting air flows from the furnace exterior through said 10 ducts into said chamber for preheating and thence through said restricted opening as a curtain between said burner and side wall. In witness whereof I afix my signature.

HARRY B. MELLOTT. 

